diff --git a/controllers/admin/AdminPPreferencesController.php b/controllers/admin/AdminPPreferencesController.php
index 4cb5beedf..c3cb9a352 100644
--- a/controllers/admin/AdminPPreferencesController.php
+++ b/controllers/admin/AdminPPreferencesController.php
@@ -223,7 +223,7 @@ class AdminPPreferencesControllerCore extends AdminController
 
 	public function beforeUpdateOptions()
 	{
-		if (!Tools::getValue('PS_STOCK_MANAGEMENT'))
+		if (!Tools::getValue('PS_STOCK_MANAGEMENT', true))
 		{
 			$_POST['PS_ORDER_OUT_OF_STOCK'] = 1;
 			$_POST['PS_DISPLAY_QTIES'] = 0;